During April 2025, Mathieu Montin focused on stabilizing the Cardano API within the IntersectMBO/cardano-api repository, addressing a critical integration blocker by exporting the fromCtxUTxOTxOut function for external use. Working primarily in Haskell and leveraging his API development expertise, he resolved a long-standing issue that had prevented downstream integrations, thereby improving the reliability and accessibility of the public API surface. His approach emphasized clear commit-level changes and documentation updates, which enhanced API hygiene and traceability. Although the work centered on a single bug fix, it demonstrated depth by reducing onboarding friction and lowering maintenance overhead for external clients.